CN103819218A - Method for producing aerated concrete block from iron tailings - Google Patents
Method for producing aerated concrete block from iron tailings Download PDFInfo
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- CN103819218A CN103819218A CN201410006471.3A CN201410006471A CN103819218A CN 103819218 A CN103819218 A CN 103819218A CN 201410006471 A CN201410006471 A CN 201410006471A CN 103819218 A CN103819218 A CN 103819218A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
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- Y02W30/91—Use of waste materials as fillers for mortars or concrete
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Abstract
The invention relates to a method for producing an aerated concrete block from iron tailings. The method comprises the following steps: 1), removing the mud from the iron tailings in advance, then grinding to obtain a powder material; 2), mixing the powder material obtained in the step 1) with cement and lime to obtain a mixed material; 3), stirring and mixing uniformly the mixed material obtained in the step 2) with water, and after size mixing, adding a retarder and a foaming agent into a mould and foaming to obtain a blank; and 4), standing and procuring the blank obtained in the step 3), turning over, cutting, and conducting autoclaved curing at high temperature, to obtain the aerated concrete block. The iron tailings are taken as the main materials, and proper amount of assistants is added to prepare the light energy-saving and environmentally-friendly aerated concrete block, so that the problem of comprehensive utilization of metallurgy solid waste of magnetite tailings is solved, and a novel utilization way is opened up to turn the solid waste of a metallurgical mine into wealth and turn a disadvantage into an advantage.
Description
Technical field
The present invention relates to a kind of production method of air-entrained concrete building block, relate in particular to a kind of method of iron tailings production air-entrained concrete building block.
Background technology
Air-entrained concrete building block is the New Building Materials that a kind of light porous, heat insulating, fire resistance are good, can follow closely, can saw, can dig and have certain shock resistance.The general weight of air-entrained concrete building block is 500-700 kilograms per cubic meter, is only equivalent to the 1/4-1/3 of clay brick and Dinas brickes, and 1/5 of normal concrete, is one lighter in concrete, is applicable to the infilled wall of Highrise buildings and the bearing wall of low-rise building.Use this material, can make the deadweight from the mixed structural construction of anharmonic ratio common brick of whole building reduce more than 40%.Because structural weight per square meter alleviates, destructive power of the earthquake is little, so also can greatly improve the shock resistance of buildings.
At present, be the lightweight mine tailings such as flyash for the production of the main raw material of air-entrained concrete building block, domestic aerated coal ash concrete material has obtained emphasis propagation and employment.As CN101570415A discloses a kind of autoclave aerated concrete building block, formed by lime, cement, flyash, gypsum, aluminium powder, admixture; Its every cubic metre weight proportion is: lime 112.5-125kg, cement 15.75-17.5kg, flyash 432-480kg, gypsum 74.7-83kg, aluminium powder 0.03895-0.004305kg, admixture 0.0095-0.0105kg.CN1624267A discloses a kind of porous concrete building blocks, and it is to be made up of the raw material of following weight per-cent: cement 55～65%, coal ash 34～45%, whipping agent 0.2～0.6%, additive 0.2～0.5%.
But fly ash is limited, the method for production air-entrained concrete building block of developing other is necessary.And in recent years increase gradually with the research of mill tailings production building materials, as CN101713229A discloses a kind of autoclave aerated concrete building block, it uses copper ore tailings is main raw material, by copper ore tailings with ball mill levigate make slurry then with cement, levigate unslaked lime, desulfurated plaster is made the slip of certain concentration after batching stirs, then add the aluminium paste of a certain amount of ready made certain concentration, after stirring, first the slip pore finishing rolls being poured into after mould is carried out to pore arrangement, then rest and get angry, carry out stripping operation by turnover traveling afterwards, framed successively through again organizing mould after the demoulding, cleaning oiling, cast, base substrate after the demoulding is delivered to cutting machine by dolly and is carried out on request longitudinal and transverse six cuttings, the base substrate of well cutting is transported on the steam-cured dolly before autoclave and is organized into groups by traveling crane, then send into autoclave and carry out autoclave at high temperature maintenance, after finishing, steam press maintenance goes out still carrying, before after carrying, dolly returns to still, organize into groups, side plate returns to cut length and organizes mould, and finished product is sent into finished goods warehouse and deposited.
And the iron tailings amount of output accounts for the more than 70%～90% of its total amount in the metallurgical mine mineral course of processing, to the processing of these tailings, current that mostly takes be mine tailing filling, dryly drain heap and prepare building material, mine tailing filling, the dry heap that drains are not only in taking a large amount of soils, need to consume a large amount of human and material resources tailings is shifted, also brought great hidden danger because there is the danger of tailings storehouse dykes and dams dam break to environment and safety simultaneously.Prepare building material and exist many current insoluble problems as mine tailing proportion is large, granularity is thicker, the product strength of preparing is low, sometimes can not meet needs of energy-saving building material product etc.
Summary of the invention
The object of the present invention is to provide a kind of iron tailings to produce the method for air-entrained concrete building block, method of the present invention is produced air-entrained concrete building block with the especially low poor vanadium titanium of iron tailings, can largely utilize metallurgical mine solid waste and providing to meet the building material product of the lightweight of national standard, energy-conservation, sound insulation, environmental protection.
In order to achieve the above object, the present invention adopts following technical scheme:
Low poor vanadium ferrotianium mine tailing is produced a method for air-entrained concrete building block, comprises the steps:
1), by low poor vanadium ferrotianium mine tailing predictive desliming, then grind and obtain powder;
2) by step 1) compound that mixes with cement, lime of gained powder;
3) by step 2) gained compound and water stirring, mix, after sizing mixing, add retardant, the foaming of foaming agent injection molding to become base substrate;
4) by step 3) gained base substrate stops precuring, upset cutting, autoclave at high temperature maintenance through quiet, obtains described air-entrained concrete building block.
Adopt predictive desliming, grind classification technique, can improve the sial content in low poor vanadium ferrotianium mine tailing, reduce mine tailing granularity, improve mine tailing size composition, and the early strength of adding auxiliary agent raising goods, utilize low poor vanadium ferrotianium mine tailing to prepare the air-entrained concrete building block complying with the national standard requirements thereby realize.
In method of the present invention, step 1) described iron tailings is low poor vanadium ferrotianium mine tailing.
In method of the present invention, step 1) granularity of described powder is less than 0.2mm, for example, be 0.1-0.15mm, and 0.12-0.18mm, 0.05-012mm etc., be preferably less than 0.080mm.
In method of the present invention, step 2) described in powder 50wt%～80wt% in compound, be for example 53%, 58%, 65%, 71%, 77% etc., cement 5wt%～25wt%, be for example 7%, 11%, 15%, 19%, 24% etc., lime 10wt%～35wt% is for example 13%, 18%, 25%, 30%, 34% etc.; Be preferably powder 60wt%～70wt%, cement 10wt%～15wt%, lime 15wt%～25wt%.Reach the Match of elemental compositions such as silicon in raw material, aluminium and calcium iron, form the stoicheiometry of hydrated product.
In method of the present invention, step 3) in water be 0.4～0.8 with the ratio of compound, be for example 0.5,0.58,0.62,0.66,0.71,0.76,0.79 etc., be preferably 0.56～0.64.
In method of the present invention, step 3) in take the total amount of compound and retardant, foaming agent as benchmark, described retardant is 0.3wt%～5wt%, be for example 0.6%, 1.2%, 2.0%, 2.5%, 3.3%, 4.5% etc., foaming agent is 0.02wt%～0.25wt%, be for example 0.05%, 0.09%, 0.15%, 0.19%, 0.23% etc., preferably retardant is 1wt%～3wt%, and foaming agent is 0.05wt%～0.10wt%.
Wherein, retardant can use gypsum, soda ash etc., and foaming agent can use aluminium powder cream etc.
In method of the present invention, step 4) described in the quiet time that stops precuring be more than 1h, be for example 1.3h, 1.8h, 2.5h, 3h, 4.5h, 6h etc., be preferably 2～4h.
In method of the present invention, step 4) described in time of autoclave at high temperature maintenance be more than 5h, be for example 5.5h, 7h, 9h, 10.5h, 12h etc., be preferably 8～10h.
In method of the present invention, step 4) described in the temperature of autoclave at high temperature maintenance be 150～250 ℃, be for example 155 ℃, 170 ℃, 190 ℃, 210 ℃, 235 ℃, 246 ℃ etc., be preferably 180～200 ℃; The pressure of autoclave at high temperature maintenance is 0.5-2.0MPa, for example, be 0.7MPa, 1.1MPa, 1.5MPa, 1.9MPa etc., is preferably 0.8-1.2MPa.
While preparing steam pressurized foam concrete, under normal pressure, after lime dissolves in water, and various mineral in cement are as C
3s, C
2s, C
3a, C
4first there is hydration reaction in AF, generates Ca (OH)
2, various types of C-S-H gum materials and a small amount of hydrated calcium aluminate sulfate crystal.C
3when S aquation, separate out Ca (OH)
2raising slip basicity is conducive to aluminium powder gets angry, C
3a aquation is accelerated the just growth of plastic strength of slip, and being formed with of aquation ca aluminosilicate crystal is beneficial to raising blank strength.Adopt the intensity of the production technique increase goods of autoclave steam pressure, at the steam-cured lower lime of High Temperature High Pressure and activeconstituents SiO
2, A1
2o
3reaction obtains the intensity of base substrate, cement and SiO
2, A1
2o
3resultant after hydration reaction is C-S-H gel and tobermorite, and the composition that has neither part nor lot in reaction is together cementing.
The present invention is with iron tailings, especially for the iron selection tailings of the low poor vanadium titano-magnetite in Chengde area is main raw material, be equipped with the main agglutinate such as calcium lime powder, cement, mix aluminium powder, additive is foaming agent and auxiliary agent, after foaming is rested, prepare air-entrained concrete building block.The multi-functional air-entrained concrete building block forming by preparation method of the present invention, has realized iron tailings construction material lightweight, useless, energy-conservation, the healthy developing goal of profit.
As optimal technical scheme, method of the present invention, comprises the steps:
1), by low poor vanadium ferrotianium mine tailing predictive desliming, then grind and obtain the powder that granularity is less than 0.080mm;
2) by step 1) gained powder and cement, lime is mixed to get compound, wherein powder 60wt%～70wt%, cement 10wt%～15wt%, lime 15wt%～25wt%;
3) by step 2) gained compound and water adds retardant, the foaming of foaming agent injection molding to become base substrate after sizing mixing; Water is 0.56～0.64 with the ratio of compound; Take the total amount of compound and retardant, foaming agent as benchmark, described retardant is 1wt%～3wt%, and foaming agent is 0.05wt%～0.10wt%;
4) by step 3) gained base substrate stops autoclave at high temperature maintenance 8～10h under precuring 2～4h, upset cutting, 180～200 ℃, 0.8-1.2MPa through quiet, obtains described air-entrained concrete building block.
Preparation method of the present invention has following beneficial effect:
1) method of the present invention can largely be utilized metallurgical mine solid waste, makes lightweight, energy-saving building material product;
2) dry density of the air-entrained concrete building block that the inventive method makes is 590kg/m
3～610kg/m
3, mean compressive strength is more than 3.6MPa, freezes more than rear intensity reaches 2.9MPa, dry shrinkage coefficient value is below 0.39mm/m, below thermal conductivity 0.14W/ (mk), meets the quality grade requirement of A3.5B06 in GB11968-2006;
3) other index of the air-entrained concrete building block that the inventive method makes, as size deviation, plain bending, surface porosity situation all meets GB requirement, can be used for industry in building trade and the material of construction such as framework partition wall and enclosure wall of covil construction;
4) air-entrained concrete building block that the inventive method makes has the feature of lightweight, energy-conservation, sound insulation, environmental protection.
Accompanying drawing explanation
Fig. 1 is the process flow diagram that low poor vanadium ferrotianium mine tailing of the present invention is produced air-entrained concrete building block.
Embodiment
For ease of understanding the present invention, it is as follows that the present invention enumerates embodiment.Those skilled in the art should understand, described embodiment helps to understand the present invention, should not be considered as concrete restriction of the present invention.
Iron tailings is produced a method for air-entrained concrete building block, comprises the steps:
1) selecting iron tailings is raw material, through predictive desliming, then grinds classification and high density grade coupling, under higher concentration (as: 35%～65%) condition, carries out classification process, obtains the low poor vanadium ferrotianium mine tailing powder that granularity is less than 0.2mm;
2) by weight ratio: the low poor vanadium ferrotianium mine tailing 50wt%～80wt% after treatment that learns from else's experience, with addition of cement 5wt%～25wt%, lime 10wt%～35wt%, reaches the Match of elemental compositions such as silicon in raw material, aluminium and calcium iron, forms the stoicheiometry of hydrated product;
3) material is sized mixing by ratio of water to material 0.4～0.8, stir, mix; Add retardant 0.5wt%～5wt%, foaming agent 0.02wt%～0.25wt%; Add after foaming agent, the foaming of 0.5min～2min injection molding, firmly forms Aerated concrete blank through cement and retardant microvesicle;
4) through quietly stopping, more than precuring 1h, by base substrate upset, press the cutting of finished product size requirements; Enter autoclave at high temperature still, under 150～250 ℃, 0.5-2.0MPa, more than steam press maintenance 5h, steam-cured process is program intelligent control, finally obtains the air-entrained concrete building block finished product of light energy conservation.
Embodiment 1
Iron tailings is produced a method for air-entrained concrete building block, comprises the steps:
1), by low poor vanadium ferrotianium mine tailing predictive desliming, then grind and obtain the powder that granularity is less than 0.080mm;
2) by step 1) gained powder and cement, lime is mixed to get compound, wherein powder 52wt%, cement 25wt%, lime 23wt%;
3) by step 2) gained compound and water adds retardant, the foaming of foaming agent injection molding to become base substrate after sizing mixing; Water is 0.5 with the ratio of compound; Take the total amount of compound and retardant, foaming agent as benchmark, described retardant is 4.5wt%, and foaming agent is 0.15wt%;
4) by step 3) gained base substrate stops autoclave at high temperature maintenance 7h under precuring 2h, upset cutting, 200 ℃, 0.7MPa through quiet, obtains described air-entrained concrete building block.
Embodiment 2
Iron tailings is produced a method for air-entrained concrete building block, comprises the steps:
1), by low poor vanadium ferrotianium mine tailing predictive desliming, then grind and obtain the powder that granularity is less than 0.015mm;
2) by step 1) gained powder and cement, lime is mixed to get compound, wherein powder 78wt%, cement 5wt%, lime 17wt%;
3) by step 2) gained compound and water adds retardant, the foaming of foaming agent injection molding to become base substrate after sizing mixing; Water is 0.8 with the ratio of compound; Take the total amount of compound and retardant, foaming agent as benchmark, described retardant is 0.5wt%, and foaming agent is 0.05wt%;
4) by step 3) gained base substrate stops autoclave at high temperature maintenance 10h under precuring 4h, upset cutting, 150 ℃, 2.0MPa through quiet, obtains described air-entrained concrete building block.
Embodiment 3
Iron tailings is produced a method for air-entrained concrete building block, comprises the steps:
1), by low poor vanadium ferrotianium mine tailing predictive desliming, then grind and obtain the powder that granularity is less than 0.20mm;
2) by step 1) gained powder and cement, lime is mixed to get compound, wherein powder 65wt%, cement 10wt%, lime 25wt%;
3) by step 2) gained compound and water adds retardant, the foaming of foaming agent injection molding to become base substrate after sizing mixing; Water is 0.64 with the ratio of compound; Take the total amount of compound and retardant, foaming agent as benchmark, described retardant is 2wt%, and foaming agent is 0.8wt%;
4) by step 3) gained base substrate stops autoclave at high temperature maintenance 9h under precuring 1.5h, upset cutting, 190 ℃, 1.0MPa through quiet, obtains described air-entrained concrete building block.
The performance of the air-entrained concrete building block making according to GB11968-2006 test implementation example 1-3.Result is as follows: dry density is 590kg/m
3～610kg/m
3, ultimate compression strength is more than 3.6MPa, freezes more than rear intensity reaches 2.9MPa, dry shrinkage coefficient value is below 0.39mm/m, below thermal conductivity 0.14W/ (mk); Size deviation, plain bending, surface porosity situation all meets GB requirement.
Applicant's statement, the present invention illustrates detailed process equipment and process flow process of the present invention by above-described embodiment, but the present invention is not limited to above-mentioned detailed process equipment and process flow process, do not mean that the present invention must rely on above-mentioned detailed process equipment and process flow process and could implement.Person of ordinary skill in the field should understand, any improvement in the present invention, and the selections of the equivalence replacement to the each raw material of product of the present invention and the interpolation of ancillary component, concrete mode etc., within all dropping on protection scope of the present invention and open scope.
Claims (10)
1. iron tailings is produced a method for air-entrained concrete building block, comprises the steps:
1), by iron tailings predictive desliming, then grind and obtain powder;
2) by step 1) compound that mixes with cement, lime of gained powder;
3) by step 2) gained compound and water stirring, mix, after sizing mixing, add retardant, the foaming of foaming agent injection molding to become base substrate;
4) by step 3) gained base substrate stops precuring, upset cutting, autoclave at high temperature maintenance through quiet, obtains described air-entrained concrete building block.
2. the method for claim 1, is characterized in that step 1) described iron tailings is low poor vanadium ferrotianium mine tailing.
3. method as claimed in claim 2, is characterized in that step 1) granularity of described powder is less than 0.2mm, is preferably less than 0.080mm.
4. the method for claim 1, is characterized in that step 2) described in powder 50wt%～80wt% in compound, cement 5wt%～25wt%, lime 10wt%～35wt%; Be preferably powder 60wt%～70wt%, cement 10wt%～15wt%, lime 15wt%～25wt%.
5. the method for claim 1, is characterized in that step 3) in water be 0.4～0.8 with the ratio of compound, be preferably 0.56～0.64.
6. the method for claim 1, it is characterized in that, step 3) in take the total amount of compound and retardant, foaming agent as benchmark, described retardant is 0.3wt%～5wt%, foaming agent is 0.02wt%～0.25wt%, preferably retardant is 1wt%～3wt%, and foaming agent is 0.05wt%～0.10wt%.
7. the method for claim 1, is characterized in that step 4) described in the quiet time that stops precuring be more than 1h, to be preferably 2～4h.
8. the method for claim 1, is characterized in that step 4) described in time of autoclave at high temperature maintenance be more than 5h, to be preferably 8～10h.
9. the method for claim 1, is characterized in that step 4) described in the temperature of autoclave at high temperature maintenance be 150～250 ℃, be preferably 180～200 ℃; The pressure of autoclave at high temperature maintenance is 0.5-2.0MPa, is preferably 0.8-1.2MPa.
10. the method for claim 1, is characterized in that, comprises the steps:
1), by low poor vanadium ferrotianium mine tailing predictive desliming, then grind and obtain the powder that granularity is less than 0.080mm;
2) by step 1) gained powder and cement, lime is mixed to get compound, wherein powder 60wt%～70wt%, cement 10wt%～15wt%, lime 15wt%～25wt%;
3) by step 2) gained compound and water adds retardant, the foaming of foaming agent injection molding to become base substrate after sizing mixing; Water is 0.56～0.64 with the ratio of compound; Take the total amount of compound and retardant, foaming agent as benchmark, described retardant is 1wt%～3wt%, and foaming agent is 0.05wt%～0.10wt%;
4) by step 3) gained base substrate stops autoclave at high temperature maintenance 8～10h under precuring 2～4h, upset cutting, 180～200 ℃, 0.8-1.2MPa through quiet, obtains described air-entrained concrete building block.
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| CN104086146A (en) * | 2014-07-23 | 2014-10-08 | 武汉理工大学 | Resource utilization method of mine tailings |
| CN104926360A (en) * | 2015-06-15 | 2015-09-23 | 郑学龙 | Foamed light brick and preparation method thereof |
| CN109734369A (en) * | 2019-03-13 | 2019-05-10 | 浙江工业大学 | A kind of foam air-entrained concrete building block and preparation method thereof prepared using iron tailings as raw material normal temperature and pressure |
| CN112174580A (en) * | 2020-08-26 | 2021-01-05 | 北京鼎创科技环保集团有限公司 | Method for producing aerated concrete building blocks by using iron tailings and waste granite |
| CN113956070A (en) * | 2021-11-22 | 2022-01-21 | 华新水泥股份有限公司 | Cement kiln tail gas carbonization autoclaved-free aerated concrete wall product and preparation method thereof |
| CN114230269A (en) * | 2021-12-06 | 2022-03-25 | 中交二公局第三工程有限公司 | Manufacturing method capable of improving forming speed of iron tailing concrete prefabricated part |
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| CN104926360A (en) * | 2015-06-15 | 2015-09-23 | 郑学龙 | Foamed light brick and preparation method thereof |
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| CN112174580A (en) * | 2020-08-26 | 2021-01-05 | 北京鼎创科技环保集团有限公司 | Method for producing aerated concrete building blocks by using iron tailings and waste granite |
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